Betelgeuse goes through periods of brightening and dimming, usually in a 400-day cycle. But in 2019, the star experienced a ...

Betelgeuse has been a favorite among amateur astronomers for many years. However you pronounce it, its unexpected dimming draws even more attention to this red supergiant variable star in Orion.

This figure shows measurements of Betelgeuse's brightness from different observatories from late 2018 to present. The blue and green points represent data from ground-based observatories.